> Are there some tools or scripts available which give me information about the
> performance of my proxy server. I want to know what's the respondse time is
> for downloading a page from the proxy's cache versus a direct request so that
> i can verify that the proxy service is usefull.
>
Have a look at the Wisconsin Proxy Benchmark:
http://www.cs.wisc.edu/~cao/wpb1.0.html